. >>> and new jersey's republican governor, chris christie, is getting some political support from an unlikely source. he's facebook's founder, mark zuckerberg, who headlined events for president obama's re-election campaign. he will host an event for christie next month at his home in california. >>> the unbearable deep freeze menacing millions of americans is delivering yet another day of biting cold temperatures, as the dangerous winter weather blows into the east and south. you can now add more snow and ice into the frigid mix. abc's tahman bradley has the latest. >> reporter: this morning, the arctic air that's making life miserable for millions is marching south. in huntsville, alabama, salt trucks are standing by. they're prepping around knoxville, tennessee. >> we're expecting the worst. you always expect the worst. >> reporter: while the midwest and northeast remain frozen -- >> got 20 layers on. body warmers, hand warmers, foot warmers. >> reporter: a new round of ice and snow is bearing down on 15 states from ohio to alabama. this cold blast, which has taken over one-third